Method of making duplicates of optical or sound recordings

Details Method of making duplicates of optical or sound recordings Method of making duplicates of optical or sound recordings

1975-01-02

1976-06-08

Kendall, Ralph S.

Coating processes

With pretreatment of the base

Preapplied reactant or reaction promoter or hardener

106 1, 264 1, 264220, 425810, C23C 302

Patent

active

039624951

ABSTRACT:
Method of making duplicate copies of information recorded in an organic plastic material as minute surface relief patterns, comprising sensitizing and activating the patterned surface, depositing a thin layer of nickel or cobalt utilizing a room temperature autocatalytic deposition process, backing up the thin metal layer with a heavier electrolytic metal deposit, separating the initial nickel or cobalt surface from the plastic surface and using the metal replica to mold or press duplicate copies in a deformable plastic.

REFERENCES:
patent: 3431120 (1969-03-01), Weisenberger
patent: 3438798 (1969-04-01), Baudrand et al.
patent: 3441428 (1969-04-01), Reinhard et al.
Schwartz, Technical Proceedings of the American Electroplaters Soc. 47 (1960) pp. 176, 179, 183.

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